Extracts 3 audio channels from a specially encoded two-channel source:
Two channels for speakers at the front—left (L) and right (R).
One channel for surround speaker or speakers at the rear—surround (S).
Describes the numerous matrixed (pre- Pro Logic) surround processors.
Placement: (three speakers in total) Three identical speakers placed equidistant around a central listening position. If two rear speakers are used they should also be placed above ear height, slightly behind the listening position, and should be of bi-polar construction.
